Machine for reducing or trimming material in strip form



Aug 28, 1928'. 1,682,663

H. E- S. CHAYES MACHINEFOR REDUCING 0R TRIMMING MATERIAL IN STRIF FORM Filed July 255, 1921 3 Sheets-$heet l Aug. 28, 1928. 1,682,663

Hf E. s. cHAYl-:s l

MACHINE FOR REDUCING OR THINKING HATERIAL STRIP FORM` mea July 2s. 1921 a Snam-snm 2 fu i 1 l @u 26 2f l a4- xNv R A T1 518% v/Lk! ATTORNEY Aug. 28, 1928.

H. E. S. CHAYES IACHINE FOR REDUCING OH TRIMMING MATERIAL IN STRIP FORM Filed July 23. 1921 3 Sheets-Sheet 3 V'EEE- 9 ENTOR Patented Aug. 28, 1928.

UNITEDy STATES PATENT OFFICE.

HERMAN E. S, CHAYES, OF NEW' YORK, N. Y., ASSIGNOR, BY MESNE ASSIGNMENTS, TO CH'AYES DENTAL INSTRUMENT CORPORATION, 0F NEWV YORK, N. Y., A COR PORATION F DELAWARE.

MACHINE FOR REDUCING `Oli. TRIMMING MATERIAL IN STRIP FORM.

Application led July 23, 1921. Serial No. 487,133.

My present invention is a machine for reducing or trimming material in strip form and is particularly designed for cutting down to accurate size the carbon sticks which are used in certain classes of dental work.

The general objects of the invention are to provide simple and practical mechanism by which strips of material such as carbon can be rapidly and accurately reduced to the exact sizes required.

Other and more specific objects are to enable the ready adaptation of the machine to the cutting of strips of different sizes and to provide for the even, uniform feed of the stock being operated upon.

Briefly, the invention comprises strip-reducing means such as cooperating grinding or reducing wheels, guides for directing the strip material to and taking it from between the reducing wheels and means for properly feeding the material. The reducing wheels, or other means, are preferably made adjustable as by means of a micrometer screw, whereby line and certain adjustments are pos sible and a weight may be utilized as the feeding force, so as to insure constant, uniform action.

Other features of the invention will become apparent as the specification proceeds.

The accompanying drawings illustrate the invention embodied in a practical form, wherein Figure 1 is a side view of the machine; Figures 2, 3 and 4 are top plan longitudinal sectional and end views, respectively, of the channel-shaped receiving and feeding guide; Figure 5 is a broken sectional view of the `tirst set of flatwise reducing meinbers; Figure 6 is a composite view illustrating the reduction of the strip in this first operation; Figure 7 is a broken sectional view of the second set or edgewise reducing members; Figure 8 is a composite view illustrating the reduction of the strip in this second operation; Figure 9 is an end view of the machine.

The reducing mechanism consists in each instance, in the machine disclosed, of a pair of cooperating grinding wheels, ofemery or the like, disposed at opposite sides of a common plane with their peripheral faces relatively closely approached, the grinding wheels of the first set, for operating on the flat sides of the strip, being designated 10 and 11 (Figures 1 and 5), and those of the second set (Figure 7 for operating on the edges of the strip, being designated 12 and 13. `The grinding wheelsof each pair are driven by suitable gearing, such as indicated at 1d in Figure 9, and they are mounted inv suitable framing 15. I 1

Adjustment of the wheels toward and away from each other is provided for, in the illustration, by supporting the upper grinding wheel of each set in a bearing or housing 16, slidably supported in the main frame and adapted to be shifted by means of a screw 17, having a micrometer adjust-ment at 18.

The strip stock is guided and supported at opposite sides if the cutting plane by means consisting of an entrance guide 19 and an exit guide 20, these guides being shown of tubular construction so as to brace the stock on all sides, the former being disposed at the entering side of the cutters and the latter in line and at the exit side of the cutters. These cooperating guides are preferably held in alignment, as by means of the connecting plates 21, which are shown hollowed out. and cut away at the centre, at 22, to afford elearance to reducing Wheels. The passage 23 in the entrance guide, is in each instance of a size to accommodate the unfinished portion 24. of the strip stock and the passage 25 in the :rit guide is of reduced size to take the reduced section 26 of the strip. The approached ends of the guides `are shown as tapered or reduced, at 27, to enable said guides being extended in as close as possible to the cutting plane.

An introductory guide 28 is shown provided, in the form of anopen trough or channel, in line with the entrance guide.` This enables the stock being fed into the machine by simply dropping the strips into this opentop guide and then forcing the strips into the entrance guide and so on in between the cutters and out through the exit guide.

Automatic feeding means are provided in the form of a pusher blade 29, Working in the introductory guide and carried by a slide 30 engaged directly on said guide, said slide being thrust forward under a constant tension by a weight 31, connected thereto by a cable 32, guided over a pulley 33. This weight-operated pusher has the effect of feeding the stock with aV constant, uniform force, tending to accomplish accurate, uniform results in the reduction of the strips.

The introductor)7 guide is shown as having both a relativelywide channel 34, to take the stock when laid flat therein and a narrow ntcrmediate slot or channel 35, to take the stock when placed on edge therein and the pusher blade is shown as extending across both said slots or guideways so as to feed the stock in either position.

ln operating upon sticks of carbon, for instance, where it is desired to reduce both the thickness and the width, the strips may first be passed iiatwise between thickness reducing wheels such as indicated in Figure 1. After the desired number of strips have been reduced to the proper thickness, the first set of wheels are removed and the second set, or edgewisc7 reducing wheels are inserted. The strips are then run through the machine a second time, this time being set on edge in the slot 35 and reduced to the desired width.

l claim:

l. In combination, reducing wheels for operating on opposite faces of a strip of Inaterial, relatively spaced entrance and exit guides for the strip material, a plate connecting said guides, said plate having its center portion cut away and said guides having tapered portions extending into the cut away portion of the plate and entered between the reducing wheels.

2. In combination, oppositely disposed reducingnY wheels, an entrance guide for directing strip material between the reducing wheels, an exit guide disposed to take the rcduced strip, an open-sided introductory guide in alignment with the 'entrance guide, a pusher working in said introductory guide, a slide mounted on said guide and arrying the pusher, and a weight connected with said slide.

In testimony whereof I aHix my signature.

HERMAN E. S. CHAYES. 

